Sorry for the late reply,
Is your PSU by any chance the "Chicony CPB09-D220A"?
Just to clarify, as computer manufactures often get their PSUs form multiple sources.
Here is a link with some pictures, does this seem to be the exact same power supply?
Acer Aspire x3200 AX3400 X1301 AX3300 Chicony CPB09-D220A PSU Power Supply
If so, then the connectors appear standard, non-proprietary connectors. Meaning, in theory, any PSU of a similar ATX standard should work. Do you know what year your computer model was introduced into the market?
Usually, any ATX standard after a change should work, but sometimes they change quite a bit and it's best to go with a similar ATX standard.